Prosthetics: tissue conditioners

Rheology articles have been published recently on tissue conditioners


2010

1. Viscoelastic behavior of commercially available tissue conditioners under
compression. Dent Mater J. 2010 Aug 7;29(4):461-8. Epub 2010 Jul 23. Saitoh S, Sasaki K, Nezu T, Taira M.

Parallel plate rheometer in compression mode measured hardness, compressive modulus of elasticity, relaxation rate, relaxation time, and modulus of viscosity of water-immersed and non-immersed samples.
Immersion in water increases hardness, compressive elasticity,relaxation time and modulus of viscosity while decreasing the relaxation rate. It is suggested that two of the materials would perform better as functional impression materials while the third would be best as a tissue conditioner.

Blogger comment: no experimental temperature reported for rheological tests.


2. Dynamic mechanical properties of oral mucosa: Comparison with polymeric soft denture liners Mechanical Behaviour of Biomedical Materials (2010) M-H Lacoste-Ferreab, Ph Demonta, J Danduranda, E Dantrasa, D Duranb, C Lacabannea

Porcine oral mucosa was tested in creep recovery and dynamic mechanical tests using parallel plate rheometer in compression mode. Hydrated and dried samples were tested at 37C (n=2)
Soft liners were tested with ARES strain controlled rheometer in torsion rectangular mode. Loss and storage moduli were recorded from –150C to 70 C(n=2)
Adsorbed water has a plasticization effect on the mechanical properties of oral mucosa. Soft liners demonstrate viscoelastic behaviour.